Chunks disappearing in a really old world

Can't sign in to feedback.minecraft.net

1.7.1 worlds(win 10) cannot be opened in 1.7.0(iphone/ipad)

blocks stop ticking if too much restone is working at the same time

Oceans don't generate correctly in buffet worlds with the spawn set on floating islands

Touch screen buttons disappear and controller buttons appear except for the pause button.

empty hand appears in certain conditions.

you cant see what your writing in the chat (ios)

random screen that does nothing